Mary Elliot

Mary Elliot
University of Nantes | UNIV Nantes · Nantes Planetology and Geo-dynamics Lab

Doctor es Science (Université Paris XI Orsay)

About

68
Publications
12,347
Reads
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2,561
Citations
Additional affiliations
January 2012 - present
University of Nantes
Position
  • Professor (Full)
January 2011 - present
University of Nantes
Position
  • Professor (Full)
October 2002 - January 2012
The University of Edinburgh
Position
  • Lecturer

Publications

Publications (68)
Article
Full-text available
The emerged coral reef terrace sequence at Cape Laundi, on the north coast of Sumba Island (Indonesia), with at least 18 successive strandlines, remains poorly dated in spite of numerous previous data. The age discrepancies within these coral reef terraces (CRTs) were previously explained by their polycyclic nature, triggered by marine erosion and...
Article
Full-text available
Lack of constraint on spatial and long-term temporal variability of the El Niño southern Oscillation (ENSO) and its sensitivity to external forcing limit our ability to evaluate climate models and ENSO future projections. Current knowledge of Holocene ENSO variability derived from paleoclimate reconstructions does not separate the role of insolatio...
Article
Benthic foraminiferal assemblage data have been derived from a marine sediment core collected in a cold-water coral (CWC) site off northwest Scotland (near the Wyville Thomson Ridge - WTR). The record covers the last glacial period to the late Holocene. Our reconstructions enable to better constrain the paleoenvironmental changes that took place in...
Chapter
This chapter investigates ENSO variability before the instrumental era. Though generally indirect, paleoclimate observations provide information that no other source can, sampling ENSO behavior across different base states, subject to many types and intensities of external forcing, and providing a much longer statistical sample than afforded by the...
Article
Full-text available
Rapid changes in ocean circulation and climate have been observed in marine-sediment and ice cores over the last glacial period and deglaciation, highlighting the non-linear character of the climate system and underlining the possibility of rapid climate shifts in response to anthropogenic greenhouse gas forcing. To date, these rapid changes in cli...
Article
Results from a vibrocore collected on the northern edge of the Scottish continental shelf at around 300 m water depth, on the Wyville Thomson Ridge, enable to reconstruct the history of cold water coral (CWC) reef growth and demise during the Holocene period. We report on significant age differences between U/Th and 14C dates obtained on pristine w...
Data
Table 2. Locations, water depth (m), potential temperature (, °C), salinity (psu), potential density (, kg.m-3), 143Nd/144Nd and εNd values of seawater samples investigated in this study. Error bars reported for εNd values correspond to external reproducibility (2 standard deviation) derived from repeated measurements of La Jolla standard for ea...
Data
Table 1. εNd values obtained for cold-water corals from the Mingulay Reef Complex. Internal error (2 SE) corresponds to error measurement based on 90 cycles of measurements. External error (2 SD) corresponds to external reproducibility (2 standard deviation) derived from repeated measurements of La Jolla standard for each analytical session. When...
Article
Full-text available
Sundaland is the currently partially drowned continental landmass that encompasses Borneo, Sumatra, Java, and the Malay Peninsula. It has episodically been reclaimed by the sea during successive Quaternary glaciations, and is commonly thought to be vertically stable. Combining geomorphological observations with numerical simulations of coral reef g...
Article
Variations of the Sub-Polar Gyre (SPG) and the Sub-Tropical Gyre (STG) circulation during the Holocene are believed to be related to regional and global climate over this time period. To improve our understanding of these phenomena we provide new constraints on variations in surface circulation patterns using neodymium isotopes (εNd) on precisely U...
Article
The ratio of magnesium to calcium (Mg/Ca) in foraminiferal shells is commonly used as a proxy for past ocean temperature. Recent advances in elemental analyses now enable single-specimen measurements of planktic foraminifera and thus, can provide information on past seasonal and interannual variability, owing to the near-monthly lifespan of foramin...
Conference Paper
Full-text available
The giant shell middens of Vendée (France) were made of several billions of flat oyster shells accumulated during the second half-part of the Medieval Warm Period (9th to 13th c.). No ancient text mentions a massive oyster-fishing activity along the Vendée coasts during this period. Thus, those middens constitute very precious structures to underst...
Article
Full-text available
U-Th ages and temperatures derived from Li/Mg have been measured on coral fragments of Lophelia pertusa and Madrepora oculata collected from two sediment cores, which were taken from cold-water coral (CWC) mounds at 700–790m water depth at the SW Rockall Trough margin. Our data, combined with previous published data, have allowed us to first estima...
Article
Many islands of the eastern Indonesian Archipelago exhibit Late Cenozoic sequences of coral reef terraces. In SE Sulawesi, on the Tukang Besi and Buton archipelagos, we identified 23 islands bearing such sequences. Remote sensing imagery and field mapping combined to U/Th and 14C dating enable to establish a chronologic framework of the reef terrac...
Article
Full-text available
Global variations in reef productivity during the Quaternary depend on external parameters that may alter the global chemical balance in the oceans and atmosphere. We designed a numerical model that simulates reef growth, erosion and sedimentation on coastlines undergoing sea‐level oscillations, and uplift or subsidence. We further develop a probab...
Article
Pb/Ca profiles were measured on ten live collected Ostrea edulis from three sites characterized by different levels of lead content. Intra-shell and inter-shell reproducibility were tested comparing several Pb/Ca profiles measured by LA-ICP-MS within a specimen, and within specimens from the same site. Results indicate that signals recorded are rep...
Poster
Full-text available
The shell middens of Saint-Michel-en-l’Herm and Beauvoir-sur-Mer (Vendée, France) were made of several billions of oyster shells (Ostrea edulis). Coins intercalated between shells indicate that middens were built during medieval times (9th to 13th s), but no ancient text mentions a massive oyster-fishing activity along the Vendée coasts during this...
Poster
Full-text available
Ostrea edulis is the endemic oyster of the western European coasts. It is particularly abundant in shell middens of coastal archaeological sites, since the Mesolithic. This study aims to improve our understanding of the incorporation of lead and manganese into the calcite shells, in order to test the potential of this oyster in both palaeoenvironme...
Article
Full-text available
The El Niño/Southern Oscillation (ENSO) is the leading mode of interannual climate variability. However, it is unclear how ENSO has responded to external forcing, particularly orbitally induced changes in the amplitude of the seasonal cycle during the Holocene. Here we present a reconstruction of seasonal and interannual surface conditions in the t...
Article
Rapid changes in North Atlantic climate over the last millennia were driven by coupled sea surface/atmospheric processes and rates of deep-water formation. Holocene climate changes, however, remain poorly documented due to a lack of high-resolution paleoclimate records, and their impacts on marine ecosystems remain unknown. We present a 4500 years...
Article
We present twelve seasonally resolved δ18O profiles of giant clams (Tridacna sp.) from the Huon Peninsula, Papua New Guinea, spanning discrete periods of time (9–38 years) over the past 60 ka. The inter-annual anomaly time series of these shells are used to reconstruct inter-annual variability which can predominantly be attributed in the modern cli...
Article
Full-text available
Many coasts feature sequences of Quaternary and Neogene shorelines that are shaped by a combination of sea-level oscillations and tectonics. We compiled a global synthesis of sea-level changes for the following highstands: MIS 1, MIS 3, MIS 5e and MIS 11. Also, we date the apparent onset of sequences of paleoshorelines either from published data or...
Article
CT scanning and descriptions of sedimentary sequences have been conducted to describe the internal structure and define the evolutionary sequence of events leading to the build-up of cold-water coral reef constructed by the azooxanthellate scleractinian Lophelia pertusa. Two vibrocores containing coral clasts and associated fauna embedded in a matr...
Data
The shells of marine mollusks are widely used archives of past climate and ocean chemistry. Whilst the measurement of mollusk �18O to develop records of past climate change is a commonly used approach, it has proven challenging to develop reliable independent paleothermometers that can be used to deconvolve the contributions of temperature and flui...
Article
Full-text available
The shells of marine mollusks are widely used archives of past climate and ocean chemistry. Whilst the measurement of mollusk δ18O to develop records of past climate change is a commonly used approach, it has proven challenging to develop reliable independent paleothermometers that can be used to deconvolve the contributions of temperature and flui...
Article
Full-text available
CT scanning and descriptions of sedimentary sequences have been conducted to describe the internal structure and define the evolutionary sequence of events leading to the build-up of cold-water coral reef constructed by the azooxanthellate scleractinian Lophelia pertusa. Two vibrocores containing coral clasts and associated fauna embedded in a matr...
Data
The shells of marine mollusks are widely used archives of past climate and ocean chemistry. Whilst the measurement of mollusk delta 18O to develop records of past climate change is a commonly used approach, it has proven challenging to develop reliable independent paleothermometers that can be used to deconvolve the contributions of temperature and...
Article
We compare monthly resolved oxygen isotope records derived from a giant bivalve shell, Tridacna gigas and massive Porites corals collected along the northern coast of Papua New Guinea. This intercomparison study demonstrates that δ18O profiles obtained from these different aragonite-secreting organisms collected from within a 30km range are correla...
Article
Full-text available
Reconstructions of subtropical southwest Pacific climate variability over the Pleistocene were derived from coupled planktic foraminiferal δ18O-Mg/Ca measurements taken from a southern Coral Sea sediment core. A clear shift from ∼40 kyr to ∼100 kyr modes of reconstructed glacial-interglacial sea surface temperature (SST) variability is seen over th...
Article
Full-text available
The position of the southern boundary of the Pacific warm pool is shown to have been stable since the early Pleistocene, based upon a planktic foraminiferal Mg/Ca-derived reconstruction of subtropical sea surface temperature in the Coral Sea. This contrasts with previous reconstructions showing warm pool contraction from the north and east and mean...
Article
Full-text available
Cenozoic proxy records of both the isotopic composition of dissolved inorganic carbon in the oceans (δ13CDIC) and deep ocean carbonate preservation show significant periodicities in the range 400–500 kyr. Sensitivity analysis of the ocean carbon cycle to potential variability on this timescale in patterns of global oceanic primary productivity and/...
Article
Full-text available
Uncertainties in sea-level projections for the 21st century have focused ice sheet modelling efforts to include the processes that are thought to be contributing to the recently observed rapid changes at ice sheet margins. This effort is still in its infancy, however, leaving us unable to make reliable predictions of ice sheet responses to a warmin...
Article
The onset of widespread barrier reef development in the Coral Sea region is thought to have occurred during the period 400-1000ka. Whether the timing of reef inception was limited by either global or regional climatic changes remains unresolved. Here we present a new set of paired down-core foraminiferal delta18Oplanktic - Mg/Ca measurements from t...
Article
Full-text available
1] The modern d 13 C DIC distribution in southwest subtropical Pacific deep waters is consistent with a regional mixing regime between water masses of open Pacific Ocean and Tasman Sea origin. This mixing regime is reconstructed across the middle-late Pleistocene using a record of benthic foraminiferal d 13 C in a sediment core from the New Caledon...
Article
This study investigates the environmental and biological controls on trace element partitioning and stable isotope composition of modern giant long-lived bivalves (Tridacna gigas) with the aim to use these archives for paleoclimatic reconstructions. Firstly, the intra-shell variability is studied by measuring time equivalent profiles in the differe...
Article
The Huon Peninsula is located in the heart of the Western Pacific Warm pool (WPWP), an area which plays a key role in the dynamics of El Niño Southern Oscillation (ENSO). This region experiences exceptional tectonic uplift rates of 3 to 4 meters per 1000 years. Fossil reefs are thus subaerially exposed enabling the sampling of climatic archives suc...
Article
The last glacial climate was punctuated by a number of abrupt climatic events: the Heinrich Events. These are associated with reduced North Atlantic Deep Water (NADW) formation, rises in sea level of between 10 and 30m and are known to have had global climatic impacts. These rises in sea level created accommodation space for coral reefs to grow ver...
Article
Full-text available
[1] We have investigated the environmental controls of seasonally resolved records of oxygen and carbon isotopes of modern Mercenaria mercenaria bivalves collected live from five coastal sites along the east coast of North America. Seasonal profiles of δ18O and δ13C obtained by subsampling the incremental growth layers of aragonite were compared wi...
Article
Full-text available
We measured the trace element composition (Sr/Ca, Mg/Ca and Ba/Ca) and the oxygen isotope ratio of a modern Tridacna maxima shell collected live in December 2001 from New Caledonia. Bivalves secrete daily layers of carbonate which can be sub-sampled to obtain paleoenvironmental information with seasonal resolution. T. maxima live in tropical reef e...
Article
We reconstruct environmental conditions of coastal Northwestern Florida from combined measurements of δ18O and Sr/Ca of fossil marine bivalves deposited in an archeological site during the late Holocene period. We first investigated the environmental controls of seasonally resolved records of δ18O and Sr/Ca of modern Mercenaria mercenaria and Merce...
Article
We closely compared high-resolution δ13C records of benthic foraminifera Cibicides wuellerstorfi, a proxy for deep-water ventilation, with the Dansgaard–Oeschger temperature oscillations. Our results reveal different perturbations of deep-water formation in the North Atlantic Ocean associated with the millennial-scale climate oscillations during th...
Article
We have synchronized records of ice-rafted rock debris deposits of three sediment cores from the Norwegian Sea and the Irminger Basin during the last glacial period from 10 to 50 ka by combining the use of radiocarbon dates and adjustments of physical properties. Our synchronized records indicate that layers rich in ice-rafted debris were deposited...
Article
In the mid-latitudes of the North Atlantic Ocean, six large iceberg surges, called Heinrich events, have been recognised between 60 and 10 kyr BP. They are characterised by meltwater events associated with iceberg discharges from both the Laurentide and the Fennoscandian-Greenland ice sheets. The hydrological conditions associated with these surges...
Chapter
Full-text available
The north Atlantic ocean is involved in the rapid climatic changes observed during glacial times. Indeed, many paleoclimatic indicators, from surface hydrological reconstructions, to deep water chemistry proxies, clearly indicate that major reorganizations of the Atlantic happened together with, and to some extent are probably responsible for the a...
Chapter
New evidence from deep-sea sediment cores in the subpolar North Atlantic demonstrates that a significant component of sub-Milankovitch climate variability occurs in distinct 1-2 kyr cycles. We have traced that cyclicity from the present to within marine isotope stage 5, an interval spanning more than 80 kyrs. The most robust indicators of the cycle...
Chapter
The ICP VI meeting in Lisbon has been a superb occasion for the paleoceano- graphic community to meet and discuss the recent discoveries on abrupt events in oceanic records. Numerous high quality posters focused on this subject and will aliment the literature for years ahead. In the meanwhile, we intend in this introduction to present the four pape...
Article
The millennial variability of the North Atlantic Current (NAC) and the deep NADW has been studied in Core CH 69-K09 in relation with the evolution of the Laurentide ice sheet, the Heinrich events (HE) and the orbitally driven changes of insolation. This core is located at the base of the Newfoundland margin, near the boundary between NAC and the La...
Book
Full-text available
International Conference on Paleoceanography (6th : 1998 : Lisbon, Portugal)
Article
Full-text available
High-resolution records of coarse lithic content and oxygen isotope have been obtained in a piston core from the Irminger Basin. The last glacial period is characterized by numerous periods of increased iceberg discharges originating partly from Iceland and corresponding to millennial-scale instabilities of the coastal ice sheets and ice shelves in...
Data
High-resolution records of coarse lithic content and oxygen isotope have been obtained in a piston core from the Irminger Basin. The last glacial period is characterized by numerous periods of increased iceberg discharges originating partly from Iceland and corresponding to millennial-scale instabilities of the coastal ice sheets and ice shelves in...
Article
The changes in distribution of sea surface temperature and salinity in the North Atlantic between 40 and 60°N were reconstructed for the time interval between 40 and 30 kyr BP, which includes the large iceberg discharge event associated with the deposition of Heinrich layer 4. We found that the meltwater input during deposition of Heinrich layer 4...

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Projects

Projects (2)
Archived project
Investigating growth and trace element incorporation in the shells of the flat oysters Ostrea edulis, to highlight the potential of this species for retrospective environmental biomonitoring